Fix Locale problem on Ubuntu

Recently, I saw this kind or error quite frequent. At first I thought that it was nothing.
But eventually, it’s kinda bothering me when I see the error message. :p

So, here is the solution to solve this problem.
First, run this command:

It updates /etc/default/locale with provided values.

If you see the /etc/default/locale file, it shows something like this:

If the problem still occur, maybe you can try this first before running the command above again:

Credit to http://askubuntu.com/questions/162391/how-do-i-fix-my-locale-issue/505424#505424

Any Comments?